HARDWARE COMPONENTS
- Microcontroller used is AT89S52.
- RFID module -EM-18
- Motor -12V ,30 rpm
- Motor driver -L293d
- Keypad 4 *4 matrix keypad
SOFTWARE
- Compiler -mikro c pro
- Simulator – proteus
WORKING
Rfid tags are provided for all vehicles approaching the toll plaza.Predefined rfid codes along with their account balance and the toll to be deducted is stored in the memory.In beginning, the user is prompted to scan his tag or ID.The serial code of the tag is identified by the Rfid reader module and is sent to Micro controller for comparison with stored data. If the ID is matched by the microcontroller , the toll amount is deducted from user’s balance and lcd displays ”thank you user” ,then barrier is lifted.If balance is below Rs.10 , Lcd displays “Insufficient balance”. “please recharge” by entering amount through the keypad”.The user does not get access until he adds more balance to his account.The recharge amount is entered by using a Keypad . Microcontroller again checks the balance .If sufficient, barrier is lifted.
HARDWARE -CIRCUIT
SIMULATION
Download simulation files
PROGRAM
//RX PIN 10 (P3_0) //RFID(EM-18 MODULE)
//TX PIN 11 (P3_1)
int user1amt=45, user2amt=50,user3amt=70,amounttodisplay;
int k1,k2;
char cardletter;//rfid variable
//lcd connections
sbit LCD_RS at P2_3_bit;
sbit LCD_EN at P2_2_bit;
sbit LCD_D4 at P2_1_bit;
sbit LCD_D5 at P2_0_bit;
sbit LCD_D6 at P2_4_bit;
sbit LCD_D7 at P2_5_bit;
//motor
sbit motor11 at P2_7_bit;
sbit motor12 at P2_6_bit;
//KEYPAD CONNECTIONS
#define R1 P1.F0 //pin 1
#define R2 P1.F1 //pin 2
#define R3 P1.F2 //pin 3
#define R4 P1.F3 //pin 4
#define C1 P1.F4 //pin 13
#define C2 P1.F5 //pin 14
#define C3 P1.F6 //pin 15
int key=12;
void keydelay(void);
void keypadinit(void);
void keycheck(void);
void card1(void);
void card2(void);
void card3(void);
void rfid(void);
void forwardmotor(void) ;
void stopmotor(void);
void nobalance(void);
void balance(void);
void lcdstart(void);
void main()
{
keypadinit();
uart1_init(9600);
lcdstart(); // Write text in first row
stopmotor();
while (1)
{
rfid();
}
}
void rfid(void)
{
if (UART1_Data_Ready())
{
cardletter = UART1_Read();
card1();
card2();
card3();
}
}
void card1(void)//card no.1000699A58BB(PRINTED NO.10539512)
{
if(cardletter==’6′)
{
while(!(UART1_Data_Ready()));
cardletter = UART1_Read();
if(cardletter==’C’)
{
if(user1amt>49) {user1amt= user1amt-50;
amounttodisplay= user1amt;
balance(); forwardmotor();
}
else
{
nobalance();
keycheck();k1=key; Lcd_Chr(2, 3, k1+0x30);
keycheck();k2=key; Lcd_Chr(2, 4, k2+0x30);
user1amt=user1amt + k1*10 +k2;
amounttodisplay= user1amt;
balance();
}}}}
void card2(void)//card no.1000699A58BB(PRINTED NO.10539512)
{
if(cardletter==’1′)
{
while(!(UART1_Data_Ready()));
cardletter = UART1_Read();
if(cardletter==’C’)
{
if(user2amt>49) {user2amt= user2amt-50;
amounttodisplay= user2amt;
balance(); forwardmotor();
}
else
{
nobalance();
keycheck();k1=key; Lcd_Chr(2, 3, k1+0x30);
keycheck();k2=key; Lcd_Chr(2, 4, k2+0x30);
user2amt=user2amt + k1*10 +k2;
amounttodisplay= user2amt;
balance();
}}}}
void card3(void)//card no.1000699A58BB(PRINTED NO.10539512)
{
if(cardletter==’D’)
{
while(!(UART1_Data_Ready()));
cardletter = UART1_Read();
if(cardletter==’E’)
{
if(user3amt>49) {user3amt= user3amt-50;
amounttodisplay= user3amt;
balance(); forwardmotor();
}
else
{
nobalance();
keycheck();k1=key; Lcd_Chr(2, 3, k1+0x30);
keycheck();k2=key; Lcd_Chr(2, 4, k2+0x30);
user3amt=user3amt + k1*10 +k2;
amounttodisplay= user3amt;
balance();
}}}}
void balance(void)
{
Lcd_Cmd(_LCD_CLEAR); Lcd_Out(1,1,”THANK YOU USER”);
Lcd_Out(2,1,”BAL “);
Lcd_Chr_cp((amounttodisplay/100)+0x30);
Lcd_Chr_cp(((amounttodisplay/10)%10)+0x30);
Lcd_Chr_cp((amounttodisplay%10)+0x30);
}
void nobalance(void)
{
Lcd_Cmd(_LCD_CLEAR); Lcd_Out(1,1,”less balance”);
Lcd_Out(2,1,”please recharge”);Delay_ms(500);
Lcd_Cmd(_LCD_CLEAR); Lcd_Out(1,1,”ENTER AMOUNT”);
}
void forwardmotor(void)
{
motor11=1; motor12=0; Delay_ms(500);
stopmotor(); Delay_ms(3000);
motor11=0; motor12=1; Delay_ms(500); stopmotor();
}
void stopmotor(void)
{
motor11=0; motor12=0;
}
void keycheck(void)
{
key=12;
do
{
C1=0;C2=1;C3=1;
if(R1==0) {key=1;}
if(R2==0) {key=4;}
if(R3==0) {key=7;}
//if(R4==0) {key=10;}
C1=1;C2=0;C3=1;
if(R1==0) {key=2;}
if(R2==0) {key=5;}
if(R3==0) {key=8;}
if(R4==0) {key=0;}
C1=1;C2=1;C3=0;
if(R1==0) {key=3;}
if(R2==0) {key=6;}
if(R3==0) {key=9;}
//if(R4==0) {key=11;}
}while(key==12);
delay_ms(300);
}
void lcdstart(void)
{
Lcd_Init(); // Initialize Lcd
// Clear display
Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off
Lcd_Out(1,6,”haii”); // Write text in first row
delay_ms(500);
Lcd_Cmd(_LCD_CLEAR); // Clear display
}
void keypadinit(void)
{
C1=1; C2=1;C3=1; //pull up
R1=1; R2=1;R3=1;R3=1; //pull up
}
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